Rotary pump



1954 B. H. M LAUGHLIN ,690,

ROTARY PUMP Filed Dec. 29, 1952 2 Sheets-Sheet l Fig.

Fig.5

Fig. 4

Barrett H. McLaughlin INVENTOR.

Oct. 5, 1954 Filed D60. 29, 1952 B. H. MCLAUGHLIN 2,690,716

ROTARY PUMP 2 Sheets-Sheet 2 Barre/I H. Mafia (541 BY @Mm Patented Got.5, 1954 ROTARY PUMP Barrett H. McLaughlin, Whitinsville, Mass.

Application December 29, 1952, Serial No. 328,446

1 Claim. 1

The present invention relates to new and useful improvements in rotarypumps and compressors.

An object of the invention is to provide a double acting abutment pumpwhich Works on the principle of increasing a volume within the pump;trapping the liquid which has been pulled in; con necting the volumewith a discharge; and decreasing that volume.

Another object is to provide a rotary pump of improved eiiiciency, whichis simple and practical in construction, relatively inexpensive tomanuiacture, and otherwise well adapted for the purpose for which thesame is intended.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanyin drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure l is a top plan view;

Figure 2 is a sectional view taken on a line 2--2 of Figure 1;

Figure 3 is a sectional view taken on a line 3-3 of Figure 2;

Figure 4 is a sectional view of the pump housing with the end plate andimpeller removed, and

Figure 5 is an enlarged sectional view of one of the abutments.

Referring now to the drawings in detail, wherein for the purpose ofillustration I have disclosed a preferred embodiment of my invention,the numeral 5 designates a pump housing formed with a circular pumpchamber 6 and provided with a removable end or cover plate 1 secured tothe housing by studs or bolts 8.

An inlet port 9 is formed in the top of the housing having asubstantially rectangular shaped throat iii extending substantially theentire width of chamber 6 and positioned substantially tangentially wtihrespect to the chamber and an outlet port 1 l is formed at one side ofthe housing and is provided with a throat l2 shaped similar to andentering chamber 6 adjacent throat it and positioned radially withrespect to chamber B.

An abutment I3 is slidable in a pocket Hi formed in the housing betweenthroats l0 and [2, the outer end of the pocket being closed by a coverplate is secured to the housing by bolts [6 and a pair of guide pins l'lproject inwardly at the inner side of the cover plate into bores 18 inthe outer end of the abutment and on which the abutment is slidable.Coil springs I9 are positioned in the bores it behind the pins toproject the inner rounded end of the abutment in the .2 chamber 6 toblock ofi throat it from throat [2.

A second abutment 26 is slidable in a pocket 2! at a substantiallydiametrically opposite side of chamber 5 from abutment l3 and the twoabutments and pockets are of duplicate construction whereby theabutments are spring projected into the chamber 6 and at an acuterearwardly disposed angle with respect to the direction of rotation ofan impeller 22 0 elliptical shape rotating in the chamber and of a sizeto have its major axis equal to th internal diameter of the chamber. Theabutments bear aga nst substantially diametrically opposite sides of theimpeller.

A drive shaft 23 is cast integrally at one flat side of the impeller andis journaled in a bushing 24 supported in a stuffing box 25 at one sideof the housing while a stub shaft 26 is cast integrally at the otherfiat side of the impeller and is journaled in a bushing 21 in a bearinrecess 28 in cover plate 7.

A pair of passages 29 and 39 are formed in the impeller and each extendtransversely with respect to the axis thereof and are inclined incrossed relation with respect to each other and have their adjacent endspositioned at opposite sides of the apex of the lobes ti and 32 0f theimpeller so that a clearance is at all times provided between thcircular wall of the chamber and the ends of the passages and while thelobes 3i and 32 are in close working contact with the wall of thechamber to block one passage from the other.

The opposite ends of the passages 29 and 36 are flared to providerelatively wide slot-like throats 33 extending substantially the entirewidth of the impeller for the unrestricted flow of liquid into and outof the passages from and to the chamber.

Th volume of fluid being pumped is always constant in the pump chamberwhile volumes between certain points within the chamber are alwayschanging. As the impeller 22 moves clockwise, the apex of lobe 3! movesaway from abutment is and towards abutment 2B and the opposite apex oflobe 32 moves away from abutment 2i! and towards abutment l3 causing theareas behind the lobes 3| and 32 to increas and pulling fluid intochamber 6 behind the lobes and forcing fluid in advance of the lobe 3|from the chamber through passage 29 and out of outlet post H, as shownby the arrows in Figure 2, and also forcing the fluid in advance of lobe32 directly out of outlet port I I.

The abutments i3 and 29 separate chamber 6 into an inlet chamber 3 5having direct communi- 3 cation with inlet port 9 and an exhaust oroutlet chamber 35 having direct communication with outlet port H, asshown by dotted lines in Figur 2, and passages 29 and 30 connect theinlet and outlet chambers to each other at all stages of the rotation ofthe impeller.

The shape of the impeller and the crossed arrangement of the passages 29and 30 cause the pump chamber 6 to be twice filled and emptied with eachcomplete revolution of the impeller.

From the foregoing, the construction and operation of the device will bereadily understood and further explanation is believed to be unenecessary. However, since numerous modifica tions and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction shown and described, andaccordingly, all suitable modifications and equivalents may be resortedto, falling within the scope of the appended claim.

What is claimed as new is as follows:

A pump comprising a housing providin a circular pump chamber andprovided with inlet and outlet ports adjacent each other, an ellipticalimpeller fitted in and rotatable in said pump chamber and havingdiametrically opposite end lobes in the major axis of the impeller, apair oi spring biased abutments slidable in said housing to project ntosaid pump chamber at diametrically opposite sides of the chamber andslidably engage said impeller, one of said abutments being locatedbetween said adjacent ports, said lobes and abutments in one directionof rotation of the impeller dividing the pump chamber into a pair ofdiametrically opposite fluid intake and a pair of diametrically oppositefluid discharge chambers communicating with said inlet and outlet portsrespectively, said lobes in said direction of rotation of the impellercreating intake in the intake chamber behind said lobes and pressure inthe discharge chamber in front of said lobes to fill said intake chamberand empty said discharge chamber through said inlet andontlet ports,respectively, and a pair of through passages in said impeller atopposite sides thereof crossed relatively to each other open at the endsthereof onto said lobes at diametrically opposite sides of the majoraxis of the impeller to cross connect said intake chambers behind saidlobes and to cross connect said discharge chambers in front of saidlobes, whereby said pump chamber is filled and emptied twice during eachrotation of said impeller.

References Cited in the file of this patent STATES PATENTS Number NameDate 1,348,103. George July 27, 19 0 2,232,951 Kosian Feb. 25, 19412,609,754 Prendergast et a1. Sept. 9, 1952 2,648,952 Dasher Aug. 18,1953 FQBE N PATE um r Cou ry Da 305,17 Germa -.---T--.-.---- 6, 1

